介绍了重离子治癌装置的最新发展状况，比较了两类典型的旋转机架的结构及光学特性, 给出了离子光学的限制条件. 设计了一台桶形机架，为兰州重离子冷却储存环应用于医学治疗进行了预研.
A simple plane rotating-gantry is proposed at the Heavy Ion Research Facility in Lanzhou (HIRFL), where a new project named Cooling Storage Ring is under construction. The gantry is 18-metre-long, 5-metre-high from upper beam axes to rotation axes. It consists of eight quadruples, two 45° and one large aperture 90° dipole magnets. It is equipped with a two-direction magnetic raster scanning system. A beam spot of radii between 2 to 5 mm can be achieved at expected transverse emittance ratios up to 1∶ 5(5∶ 1) at any rotation angle within momentum spread 0.2%. The beam size control and achromaticity at the gantry isocenter are realized by gantry optics with little help from upstream transfer line. The constraints on ion-optics and coming beam parameters for a rotation-independent beam spot are derived analytically.
参考文献
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